Punching and shearing machine



Aug. A24: 1926.

G. H. ZIMMER FUNCHING AND SHEARING MACHINE Filed March 1, 1924 2Sheets-Sheet 2 mvENTofe ATTORNEY" Patented 24, 1926.

unirsi) STATES e'o'srAv n. ZIMMER., or BUFFALO, New YORK.

PUNCHING AND SHEARING MACHIN.

Application ledMarch 1, 1924. Serial No. 696,338.

It is well known to those skilled in the art that in this type ofmachinery, it is very difficult to register the position ofthe workpiecewith respect to the punch, since the punch is some distance away fromthe workpiece when it is started upon its downward movement.

. The principal object of my invention has been to provide a device ofthis nature in which the punch may be inoved by hand down to and incontact with the workpiece before the punch is operated, whereby it maybe accurately registered therewith.

Furthermore, it has been an object to provide means whereby thereciprocating mechanism of the punch will be thrown into operation onlyafter the punch has contacted with the work-piece.

` Another Vobject has been to provide a suitable retractiiig meanswhereby the punchA and the plunger, which carries the same, maybebrought back again to its normal vertical position.

Other objects have been to provide a device which shall be simple andsafe to Operate, and inexpensive to manufacture.

The above objects and advantages have been accomplished bythe deviceshown in the accompanying` drawings, of which:

Fig. 1 is a side elevation, partly in section, of my machine withportions thereofA broken away. Y

Fig. 2 is a front elevation of the same. Fig. 3 is a view similar toFig. 1, and

shows the parts in the position where the the usual reciprocating link11, which is op` erated by the arm 12 of the punch. This arm ispivotally mounted at 13 and is shown in a fragmentary manner, since itsconnections aiid operating mechanism do not form a part of thisinvention, and furthermore, it is well known to those skilled in theart. It will be understood that the arm 12 is of the cam, eccentric, orcrank driven type, which is constantly moving so as to cause a constantreciprocation of the link 11. Mounted within the body 10 is the usualplunger 14 of the punching machine to which the punch is attached. Thisplunger is `provided with guides 18, which are mounted in suitable waysin the body 10 so that it will have a reciprocating.movement. 0n Vthetop of the plunger is mounted a block 15, which has on its upper side aconcave surface 16. When this block is moved forwardly by means, to behereinafter described, it will fill the space between the lower curved`end 17 of the reciprocating link 11 and the plunger 14, whereby theplunger 1/1 will be actuated by the link.

Arranged at the side of the body 10 is an operating arm 20, which hasnear its central portion a U-shaped` guide 21, which engages with atemporary pivot pin 22, carried by the body 10. The arm is provided withan operating handle 19. Arranged at the lower end of the arm is a weight23, which keeps the arm normally upon the temporary pivot pin 22 and inthe position shown in Fig. 1, andalso serves to keep the plunger in itsuppermost position. An auX- iliary pivot pinv is arranged soin-edistance from the temporary pivot pin 22, and, connected with it, is theupper end of a pivotal link 25. The lower end of the pivotal link 'isconnected to a pin 26, which passes through a slot 27 iii the body 10,and has its inner end secured in the guide 18. A similar pin 28 passesthrough a slot 29 and into the guide 18 on the opposite side of the inachine, and it is provided with a weight (not shown) similar to theweight 23 forcounter-balancing the plunger atthat side of the machine.

Pivotally mounted in the body 10 and ar- 'ranged near the bottomthereof, and under the weight 23, is a shaft 30 3Q', having a lever 31and a lever 32. The lever 32 is connected to the block 15 of the machineby meansof a link 33. The lever 31 carries a pin 34:,

lwhich is arranged to slide ina slot 35 formed in the end oo of anoperating link 37. The other end of the link is connected by means ot' apivotal pin 38 to the operating arm 20.

Arranged preferably at the upper end of the guides 18 is a yoke d1 whichcarries the plunger retracting mechanism. This mechanism, shown enlargedin F ig. 5, comprises a housing e2, carried by the yokedl and providedwith a cylindrical recess 43. A retracting plunger 4-5 is mounted in thehous ing e2, and is provided at its. outer end with a. ange 46, whichlits into the recess 43. A helical spring 47' is mounted in the recessand beneath .theV flange 46, whereby the plunger isfkept normally in theposition. shown in Figs.. 1, 2, and 3. The retracting plunger 45Y isprovided with a recess 48' in which is mounted a helical vspring 49 anda pressure plunger 50. The yoke 41 is provided withl two downwardlyextending arms 51 vin vwhich is pivotally mounted a plunger arm 5.2. Theupper end 53 of this plunger arm is auanged tol bear against thepressure plunger 50, and the lower end is provided with a squareshoulder 54, which engages, when in its downward position with a linedstop 55.` The fixed stop is adjustabe and carried by an arm 57 madepreferably a part ol the housing l0. The reciprocating link 11 isprovided with a recess 55 with which 'the forward end ot the retractino`luneer` :s P e.

l is engageable when the plunger is pushed inwardly and the recess is inan engageable position therewith. f

The operation of the device will be. apparent from Figs. 1,2, and 3.Then the oper- Vating arm 2O is in the position shown in Fig. `l, andduring its movement to the position shown in Fig.4 2, this arm will Vbesupported by the. temporary pivot pin 22. During this movement, thepivotal link 25, through the medium of the auxiliary pivot pin 2l andVoperated upon through the slet 85 in the lower end 36. of the operatinglink.

i/Vhen, however, the parts have. reachedftheposition shown in Fig. 3,where the punch will be. in conta-ct. with the workpiece, and the 1Operating arm is further depressed, the pivotal connection thereof' willbe transferred from the temporary pivot pin 22 to the auxiliary pivotpin 2e. When in this position the 'endof the slot 35 has been reached,and the operating link 37 is ready to oper-I ate. upon the pin 3.1i.As'Y the operating arm 2O is moved to the positionJ shown in Fig. e,

the levers 31 and 32 will be oscillated and the block 'l5 beforced inbetween they plungmemes' er 14 and the lower end 17 ol the reciprocatinglink l1, whereupon the punch will be driven through the work-piece. Whenthe operating arm is released, the weight 23 will serve to move theparts back to the positions shown in Fig. 1, and the pivotal connectionwill be transferred back to the temporary pivot pin 22 and the levers 31and 82 will be returned to the position shown in Fig. 1.

As the plunger 14 is being moved downwardly, the yoke l1 carrying theplunger retracting mechanism is also moved downwardly, and when theparts have. reached the positions shown in F ig. l, the shoulder 5e atthe lower end of the plungerarm 52 will come in contact with the linedstop 55. When the parts are moved to the positions shown in Fig.. l, theplunger arm 52 will be moved inwardly so as to Jforce the pressureplunger 50 into the recess i8 against the tension oi the spring 49. Thiswill move the retracting plunger 45 inwardly against the reciprocatinglink 11. Then thev block is pushed inwardly and the plunger is moveddownwardly by means of the link 11, the recess 5.6 in the link will bebrought into engageable position with the forward en d of the retractingplunger, and the same vill be -forced into the recess by means of theVspring 49. l/Vhen the link 11 is returned by its reciprocatingmechanisim thel weight oll the parts will provide suiiicient trictionalContact between the end of the. retracting `plunger and the recess 5.6to'V keep the saine engaged, even though the; pressure upon the plunger50, and spring 4-9 has been released by the upward movement of the4plunger arm 52. lWhen, however, the link has moved the plunger and itsconnected vparts to their uppermost posit-ions, the reversal of movementof the linkV will momentarily release the lrictional Contact of theagain moved, ashereinbetore described.`

Obviously somek modilications ol the details herein shown and describedbe made without departing from the spirit of my invention, or. the scopeo the appended claims, and I do not.. therefore, wish to be Y limited,to the enact form herein shown and described, the form shown beingmerely a preferred form thereof. v

`Having thus, described my invention, what l claim is;

Y il. ln a punching machine, the combination with Va reciprocating linka plunger, vand a movable block, of means for bringing the plunger intoregistering Contact with the workpiece before the plunger operates memesto punch Vsuch workpiece, and means for retracting the plunge-rengageable with the link. f

2. A punch mechanism comprising means for brinving, the plunger intoregistering contact with the work-piece before the plunger operates topunch such workpiece, including an operating arm, provided with twoseparate pivotal connections so -arranged that the arm will be tirstpivoted only on one of the connections, and then l only on the other ofthe connections.

3. In a punching machine, the combination with a reciprocating link, aplunger, and a movable block, of means for bringing the plunger intoregistering contact with the work-piece before the plunger operates' topunch such workpiece, comprising an operating arm, two pivotalconnections for separately and successively supporting the arm, andmeans connected with the operating arm for operating the movable blockwhen the punch has been registered with the work-piece.

4. In a punching machine, the combination with a reciprocating link, aplunger, and a movable block, of means for bringing the plunger intoregistering contact with the work-piece before the plunger operates topunch such workpiece, comprising an operating arm, two pivotalconnections for separately and successively supporting the arm, a bellcrank lever, means connecting the bell crank lever with the movableblock, slotted means connecting the operating arm with the bell cranklever, whereby the block will be moved in between the link and theplunger when the punch has been brought in contact with the work-piece.

5. In a punching machine, the combination with a body, a reciprocatinglink, a plunger, and a movable block, of means for bringing the plungerinto registering contact with the work-piece before the plunger operatesto punch such workpiece, comprising an operating arm, a temporary pivotpin for the arm carried by the body, an auxiliary pivot pin for the arm,means for connecting the auxiliary pivot pin with the plunger, and meansconnected with the operating arm for operating the movable block whenthe punch has been registered with the worlpiece.

6. In a punching machine, the combination with a body, a reciprocatinglink, a plunger, and a movable block, of means for bringing` the plungerinto registering contact with the work-piece before the plunger operatesto punch such workpiece, comprising' an operating arm, a temporary pivotpin tor the arm carried by the body, an auxiliary pivot pin for theJarm, means for connecting the auxiliary pivot pin with the plunger, abell crank lever, means connecting the bell crank lever with the movableblock, slotted means connecting the operating arm with the bell cranklever, whereby the block will be moved in' between the link and theplunger when the punch has been brought in contact with the work-piece.

7. In a punching machine, the combination with a body, a `reciprocatinglink, a plunger, and a movable block, of a plunger retracting meansmovable with the punch plunger and engageable with the link, whereby theplunger is automatically raised from the work-piece when the operationhas been completed.

8. In a punching machine, the combination with a body, a reciprocatinglink. a plunger, and a movable block, of a plunger retracting meansmovable with the punch plunger, comprising a retracting vplunger andengageable with the link, and means for actuating the retract-incrplunger when the punch plunger has reached the lower end of its travel.

9. In a punching machine, the combination with a body, a reciprocatinglink, a plunger, and a movable block, of a plunger retracting meansmovable with the punch plunger', comprising a retracting plungerengageable with the link, means for keeping the retracting plunger outof engagement with the link, and means for forcing the retractingplunger into engagement with the link when the punch plunger has reachedthe lower end of its travel.

10. In a punching machine, the combination with a body, a reciprocatinglink, a plunger, and a movable block, of a plunger retracting meansmovable with the punch plunger, comprising a retracting plunger, meansfor keeping the retracting plunger out of engagement with the link, aspring pressed pressure plunger mounted within the retracting plunger, aplunger arm movable with the punch plunger and in engagement with thepressure plunger, and a stop carried by the body with which the plungerarm is engageable when the punch has passed through the work-piece.

ll. In a punching machine, the combination with a body, a reciprocatinglink, a plunger, and a movable block, of means for registering thework-piece before the plunger operates to punch the same, comprising anoperating armprovided with two separate pivotal connections so arrangedthat the arm will be first pivoted only upon one connection, and thenonly upon the other connection, and a plungerretracting means movableWith the punch plunger, whereby the plunger is automatically raised fromthe work-piece after the punching operation has been completed.

12. In a punching machine, the combination with a body, a reciprocatinglink, a plunger, and a movable block, of means for bringing the plungerinto registering contact with the Work-piece before the plunger operatesto punch such Wolk-piece, comprising an' operating arm provided with twoseparate pvoted connections so arranged that Jche arm Will he firstpvoed only upon one connection7 and then only upon the other connection,and a plunger retract-ing means movable With the punch plunge?,Colnp'sng a retracting-plunger, and means for actuating the retraetngplunger when the 10 punch plunger has reached the lower end of itstravel.

ln testimony Wheleo'7 I have hereuntoV signed by name.

GUSTAV H. ZIMMER`

